For the gadget freaks, Ring (read Amazon) has developed a drone for inhouse security:
Of course there are privacy concerns. But I might imagine this might be solution for people that have no opportunity to install sensors (e.g. in a rented house).
Seems there is an open API for developers, so I assume one day we will see a node-red-contrib-ring-drone node popping up in our palette. Although most probably I won't be the developer of this one